<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <ul>
      <li v-for="item in arr">
        {{ item }}
      </li>
    </ul>
    <hr>
    循环下标
    <ul>
      <li v-for="(item, index) in arr">
        {{ item }}
        => 
        {{ index }}
      </li>
    </ul>
    <hr>
    循环json数组
    <ul>
      <li v-for="(item,index) in items">
        <h1>商品名称 {{item.name}}</h1>
        <p>商品价格 {{item.price}}</p>
      </li>
    </ul>
    <hr>
    循环对象
    <ul>
      <li v-for="(el,key,index) in json">
        {{ el }}
        =>
        {{ key }}
        =>
        {{ index }}
      </li>
    </ul>
  </div>
  <script src="./vue.js"></script>
  <script>
    const vm = new Vue({
      el: '#app',
      data: {
        arr: ['a','b','c','d'],
        items: [
          {
            name:'商品1',
            price:10
          },
          {
            name:'商品2',
            price:20
          },
          {
            name:'商品3',
            price:30
          }
        ],
        json: {
          a: 10,
          b: 20,
          c: 30
        }
      }
    })
  </script>
</body>
</html>